Person/People who think metallica is the greatest band in the world/existence. Known to blare that shitty ass group of cocksucker's music as loud as possible, usually within the vicinity of people who either hate, despise, or fucking want to shit down the neck of metallica (Especially at the notion that lars ulrich is the greatest drummer that ever lived) they often wear faded jeans, have really long fluffy hair that was only cool in the fucking 80's (for whatever reason) and a general misunderstanding of females.

A term used to refer to a Metallica fanboy. Used on people who like Metallica's sellout crap.

Person1: DUDE! I LOVE METALLICA! IM SUCH A BIG FAN!
Person2: Yeah?! Me too man!
Person1: I fucking love St. Anger!!! It kicks so much ass!
Person2: FUCK YOU BRO, YOU'RE NOT A METALLICA FAN! YOU ARE A METALLIFAG!!!